When I first got my Focus ST (225bhp) it had 4 of these "lumps of wood" attached to it. I soon had to replace one of the tyres after a bad puncture and what a revelation! I had the car drifting sideways down the road under reasonably heavy breaking on a couple of occasions as the 3 Zitas were no match for the replacement Pirelli P Zero on the other front corner. I've since had to swap out a other front tyre as this remaining front Zita wore out in only 5000 miles. But at least I do now have a matched set of Pirellis on the front. Much much better.
Drove 2200 miles in the Swiss Alps and down to Italy then back home to the Uk in my BMW Z4,did the Stelvio pass and the tyres performed admirably.. they are still new so I can comment for them when the get older or worn but they were good on this road trip
I drive a Mitsubishi Shogon I had the set of dunlops that were on the car when bought new from the dealer after 55k miles i had a set of zetas fitted but the chap that deals with the company cars. I always drive in permanent 4x4 and in the previous 2 years never once seen my traction control light come on. Que the zetas my traction control was like a pilot light it never went out. In the dry they didnt fill me with confidence and made the car twitchy. In the wet they were a real threat to life. I am not a boy racer and these would skid me on to the wrong lane going round bends. I complained several times to te garage that fitted them, with no joy the final straw they spun me on a slip road in to the barrier. I cannot believe these are allowed to be sold, quite simply the most dangerous thing ive drove with in the last 20 years